Our most popular LS cam for hot rod application, this cam is suited for 5.7L to 6.2L engines with aftermarket heads.  221/224 degrees of duration gives you a choppy idle and .580"/.580" lift requires 6.vsp510 valve springs.  Pulls hard from 2300-6500 rpm with GM intake.  Expect 80-100 hp with ported heads and external mods.  Ideal with a 3:40-4:10 rear gear ratio.  Hardened pushrods recommended.